So I've had Pokemon Y for for a couple years now and recently I've just been getting this strange error. Every time I enter into any Pokemon Center my game will crash and say, "An error has occurred. Hold down the POWER Button to turn off the power, then turn it on and try again. For help, visit support.nintendo.com." I know it's not a cartridge issue because I have the digital version. Does anyone know the cause of this? I already have the Lumiose City patch update.
Try deleting and redownloading the update data to see if that fixes it. It's stored in Data Management > Nintendo 3DS > Downloadable/Add-on Content. After that, just find and download the 1.5 data from the eShop.
Just wanted to update and say that I think this works. Walked into a Pokemon center with no issues thus far. Sorry, I had some updating issues with my 3DS and I finally got to update Pokemon Y today.